Is it on earth? In Canada? Is it large? Could it be seen from the ISS at the same level of magnification as the border? Is it visible in its own right, or due to the context around it? Is the feature a thing, or the absence of a thing? Is it natural? Man-made? Is it conceptual at some level? Can it be detected with the naked eye?

Is it on earth? In Canada? Is it large? Could it be seen from the ISS at the same level of magnification as the border? Yes to all. Is it visible in its own right, Yes. or due to the context around it? Is the feature a thing, Yes. or the absence of a thing? Is it natural?DOYD 'natural.' If you mean regularly occurring in unaltered nature, no. Man-made? No. Is it conceptual at some level? ??. Can it be detected with the naked eye? Yes, if the naked eye is close enough.

Can it be seen from the satellite image of Canada when there are weather forecastings? Ice involved? Is it something like made by other animals? Something that had been accumulated in the course or the years? Is it something moving? like flocks? Lights? Something caused by the movement of many animals? is it on the east coast of Canada? In the middle? It does not have a fixed position? In the sea of Canada?

With "can be seen from outer space" you mean that it can be seen in an unaltered "picture" of Canada from outer space for instance? Or just from particulare types of images (e.g. images heat sensitive or stuffs like that...not an expert)

Can it be seen from the satellite image of Canada when there are weather forecastings? Umm - I don't watch Canadian weather, but I think so. Ice involved?No. Is it something like made by other animals? YES. Something that had been accumulated in the course or the years? probably Is it something moving? like flocks? Lights? Something caused by the movement of many animals? No to all of these. is it on the east coast of Canada? In the middle? DOYD 'middle.' It does not have a fixed position? It has a fixed position. In the sea of Canada? No, on land.

With "can be seen from outer space" you mean that it can be seen in an unaltered "picture" of Canada from outer space for instance? Or just from particulare types of images (e.g. images heat sensitive or stuffs like that...not an expert) I'm not either, but I meant in the same way the border can be seen in my other puzzle.

Well I was thinking like a dam made by beavers which maybe created an "artificial" lake which could be seen from outer space...something like that Yes, it is a beaver dam, located in a remote part of northern Alberta. It is 2800 feet long. Typical beaver dams are between 30-300 feet. It was started in the 1970sI titled this 'Oh blast' because I didn't want to say 'Oh dam!'